<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <el-alert
        show-icon
        :closable="false"
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
      >
      </el-alert>
      <!-- 选择商品分类区 -->
      <el-row class="cate_options">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类级联选择器 optinos为数据源 props为配置项 -->
          <el-cascader
            checkStrictly
            clearable
            :props="cateProps"
            v-model="selectedCateKeys"
            :options="cateList"
            expandTrigger="hover"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tabs页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <!-- 作用域插槽 渲染每一项展开行里的数据 -->
              <template slot-scope="scope">
                <el-tag
                  closable
                  v-for="(item, index) in scope.row.attr_vals"
                  :key="index" @close='handleClose(index,scope.row)'>
                  {{ item }}
                </el-tag>
                <el-input
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else size="small" @click="showInput(scope.row)">
                  + New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index" label="序号"></el-table-column>
            <el-table-column
              label="参数名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加属性</el-button
          >
          <el-table :data="onlyData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <!-- 作用域插槽 渲染每一项展开行里的数据 -->
              <template slot-scope="scope">
                <el-tag
                  closable
                  v-for="(item, index) in scope.row.attr_vals"
                  :key="index" @close='handleClose(index,scope.row)'>
                  {{ item }}
                </el-tag>
                <el-input
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else size="small" @click="showInput(scope.row)">
                  + New Tag</el-button
                >
              </template>
            </el-table-column>
            <el-table-column type="index" label="序号"></el-table-column>
            <el-table-column
              label="属性名称"
              prop="attr_name"
            ></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClose"
    >
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClose"
    >
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      cateList: [],
      //级联选择器配置对象
      cateProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //级联选择器双向绑定的数组
      selectedCateKeys: [],
      //被激活的页签名称
      activeName: "many",
      //动态参数
      manyData: [],
      //静态属性
      onlyData: [],
      //控制添加对话框的显示隐藏
      addDialogVisible: false,
      //添加参数的表单数据对象
      addForm: {
        attr_name: "",
      },

      addFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
      //控制修改对话框的显示隐藏
      editDialogVisible: false,
      //修改对话框的数据对象
      editForm: {},
      //修改表单的验证规则
      editFormRules: {
        attr_name: [
          { required: true, message: "请输入参数名称", trigger: "blur" },
        ],
      },
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    //获取所有商品分类
    async getCateList() {
      const { data: res } = await this.$http.get("categories");
      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败");
      }
      this.cateList = res.data;
    },
    //级联选择框选中项变化，会触发这个函数
    handleChange() {
      this.getParamsData();
    },
    //Tabs页签点击事件的处理函数
    handleTabClick() {
      this.getParamsData();
      console.log(this.activeName);
    },
    //获取所有的参数项
    async getParamsData() {
      //证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = [];
        this.manyData=[]
        this.onlyData=[]
        return;
      }
      //根据选中的分类id，获取对应的参数
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: { sel: this.activeName },
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("获取参数失败");
      }

      res.data.forEach((item) => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(" ") : [];
        //控制文本框的显示与隐藏
        item.inputVisible=false
        //文本框输入的值
        item.inputValue=''
      });
      console.log(res.data);
      if (this.activeName === "many") {
        this.manyData = res.data;
      } else {
        this.onlyData = res.data;
      }
    },
    //监听对话框关闭事件
    addDialogClose() {
      this.$refs.addFormRef.resetFields();
    },
    //添加参数
    addParams() {
      this.$refs.addFormRef.validate(async (vaild) => {
        if (!vaild) return;
        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 201) {
          return this.$message.error("添加参数失败");
        }
        this.$message.success("添加参数成功");
        this.addDialogVisible = false;
        this.getParamsData();
      });
    },
    //展示修改对话框
    async showEditDialog(attr_id) {
      //查询当前参数的信息
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: { attr_sel: this.activeName },
        }
      );
      if (res.meta.status !== 200) {
        return this.$message.error("查询参数失败");
      }
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    //重置修改表单
    editDialogClose() {
      this.$refs.editFormRef.resetFields();
    },
    //点击按钮修改参数
    editParams() {
      this.$refs.editFormRef.validate(async (vaild) => {
        if (!vaild) return;
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName,
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("修改参数失败");
        }
        this.$message.success("修改参数成功");
        this.editDialogVisible = false;
        this.getParamsData();
      });
    },
    //根据id删除参数
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm(
        "此操作将永久删除该参数, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除");
      }
      //删除参数的业务逻辑
      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      );
      if (res.meta.status !== 200) {
        return this.$message.error("删除参数失败");
      }
      this.$message.success("删除参数成功");
      this.getParamsData();
    },
    //保存数据库中的attr_vals
    async saveAttrVals(row){
        //调用API 把这一次的数据保存到数据库
      const {data:res} =await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
          attr_name:row.attr_name,
          attr_sel:row.attr_sel,
          //数据库中attr_vals为字符串 用join把数组转换
          attr_vals:row.attr_vals.join(' ')
      })
      if(res.meta.status!==200){
          return this.$message.error('修改参数项失败')
      }
      this.$message.success('修改参数项成功')
    },
    //Tag里输入框失去焦点或回车键被按下时触发
    async handleInputConfirm(row){
      //不输入值或只输入空格  trim()去除空格
      if(row.inputValue.trim().length==0){
        row.inputValue=''
        row.inputVisible=false
        return
      }
      //有输入内容，后续处理
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue=''
      row.inputVisible=false
      this.saveAttrVals(row)
    },
    //删除对应参数项
    handleClose(index,row){
        row.attr_vals.splice(index,1)
        this.saveAttrVals(row)
    },
    showInput(row){
      row.inputVisible=true
      //文本框自动获得焦点
      //$nextTick 当页面上元素被重新渲染之后执行
      this.$nextTick(()=> {
          this.$refs.saveTagInput.focus();
        });
    }
  },
  computed: {
    //如果按钮需要被禁用，则返回true，否则false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true;
      } else {
        return false;
      }
    },
    //当前选中的三级分类id
    cateId() {
      if (this.selectedCateKeys.length == 3) {
        return this.selectedCateKeys[2];
      } else {
        return null;
      }
    },
    //动态计算标题文本
    titleText() {
      if (this.activeName == "many") {
        return "动态参数";
      }
      return "静态属性";
    },
  },
};
</script>
<style lang="less" scoped>
.cate_options {
  margin: 16px 0;
}
.el-tag {
  margin-right: 10px;
}
.el-input{
  width: 120px;
}
</style>
    
